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By P.G. Kistemaker and N.M.M. Nibbering (Eds.)

Those court cases, containing the texts of the invited lectures, disguise all elements of mass spectrometry together with thought, basic reviews, functions and instrumentation. Emphasis is put on contemporary advancements. a whole directory of the posters is incorporated

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G. /Int. J. Mass Spectrom. Ion Processes 118/JJ9 (1992) 37-70 43 radius, r, is simply: in which T is the excitation period, and E is the amplitude of the electric field (under the assumption that the ions were at rest prior to excitation). f. g. "quadrature" excitation), the electric field amplitude (or the excitation period) can be cut in half and still produce the same effect. Single-frequency excitation at a (non-resonant) frequency other than vc results in a beat pattern (forced oscillation) [51]; the cyclotron radius increases and decreases periodically at the frequency difference between the cyclotron and the excitation frequencies.

Mass Spectrom. Ion Processes, 86 (1988) 61. 13 C D . B. -T. Tao, J. M. G. Nuzzo, J. Am. Chem. Soc, 111 (1989)321. E. , C. E. G. Cooks, to be published. 15 T. L. G. Cooks, J. Serb. Chem. Soc, 55 (1990) 247. E. E. G. E. Chidsey, J. Am. Chem. Soc, in press. 17 M. R. G. Cooks, Org. , 23 (1988) 585. M. ), Continuous-flow Fast Atom Bombardment Mass Spectrometry, Wiley, Chichester, 1990. E. O. T. Kissinger, Anal. , 63 (1991) 773A. M. N. Lin, Proc Natl. Acad. Sci. , 87 (1990) 240. A. C. G. Enke, Anal. , 62 (1990) 1265.

This time-of-flight problem has been addressed by several investigators, and has been studied extensively for ion transfer in the dual-trap geometry in which the two traps are both located in the homogeneous region of the magnetic field [44]. From an external ion source, time-of-flight effects may be used to advantage to separate and isolate species of different mass-to-charge ratio (m/z) [33b,36]. Alternatively, it has been shown that externally-formed ions may be collected in one ion trap in the fringe field of the magnet, and then pulsed out together so as to improve the duty cycle for ion formation [44d]; ion transfer has also been demonstrated between two ion traps placed in two different magnets [45].

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